Pedestal Studies at ASDEX Upgrade

The ASDEX Upgrade suite of edge pedestal diagnostics has been significantly improved. A new edge ion temperature and toroidal velocity diagnostic as well as a novel diagnostic for radial electric fields (Er) have been added. The application of integrated data analysis in a probabilistic framework contributes substantially to the quality of Er and electron density profiles. The equilibrium reconstruction, taking into account scrape off layer (SOL) tile currents, renders equilibria on a 1 ms time base, which are used for mapping edge profile data synchronized to edge localised modes (ELMs). An example is shown, where the width of the pedestal pressure increases with NBI heating power, which can be assigned to ion and electron temperature profiles. The analysis of profiles over an ELM cycle shows that conclusions regarding the convective or conductive nature of an ELM can only be drawn with an accurate knowledge of the plasma position.